Xenotropic murine leukemia virus-related virus (XMRV) is a gammaretrovirus reported to be associated with human prostate cancer and chronic fatigue syndrome. Since retroviruses cause various cancers, and XMRV replication might be facilitated by HIV-1 co-infection, we asked whether certain patients with HIV-associated lymphomas are infected with XMRV. Analysis of PMBCs and plasma from 26 patients failed to detect XMRV by PCR, ELISA, or Western blot, suggesting a lack of association between XMRV and AIDS-associated lymphomas.

could there be a lack of xmrv in HIV because they are already on anti-retro drugs?????????????????

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It's possible it has an effect, yes.

That patients with HIV don't have XMRV, really doesn't say a lot, I think. They have compromised immune systems, but that doesn't have to mean they have XMRV. And I am not even sure if the researchers from this paper can reliably detect this virus anyway. So I am not sure this recent study adds anything new to the table...